Add Storage Intelligence disk performance diagnostics

[pranjal-abhyankar]

What does this PR do?

Adds the read-only storage_disk_diagnose tool under the existing Storage toolset for Storage Intelligence disk performance troubleshooting.

The tool supports standalone VM, canonical VM scale set instance, and attached managed-disk resource IDs, plus friendly VM selection by subscription/resource group/name and optional filtering for up to 64 attached disks. Optional start and end timestamps must be supplied together, use explicit-offset ISO 8601/RFC3339 formatting, and define a window of no more than 24 hours.

The implementation forwards successful Storage Intelligence JSON without owning its response schema, while bounding responses with a provisional 10 MiB safety limit. Empty, malformed, or oversized successful responses produce sanitized upstream-service errors. The change also includes VMSS-aware disk-name resolution, strict ARM resource-ID validation, public-cloud endpoint defaults with operator overrides, AOT-safe serialization, documentation, focused tests, and recorded Playback coverage.

The recording fixture uses a Standard_D2ds_v6 VM with NVMe in westus2. Host-latency enrichment remains optional because Storage Intelligence may omit latencyMetrics when telemetry is unavailable.

Validation completed:

• Focused command, service, and resolver tests passed.
• Storage source, Storage test-project, and Azure MCP Server builds passed with zero warnings and errors.
• ./eng/scripts/Test-Code.ps1 -TestType Recorded -Paths Storage passed: 30 succeeded, 3 pre-existing skips, 0 failures.
• ./eng/scripts/Build-Local.ps1 -VerifyNpx passed.
• ./eng/scripts/Update-AzCommandsMetadata.ps1 passed.
• ./eng/common/spelling/Invoke-Cspell.ps1 passed; targeted CSpell validation of the previously failing files reported zero issues.
• Bicep compilation and git diff --check passed.
• Published and restored merged recording Azure.Mcp.Tools.Storage.Tests_c146aafbb5; Playback passed from the published tag.
• Final repository-specific code review found no remaining code blockers.
• Tool Description Evaluator was run for the original description: all five related prompts ranked Update README.md #1, with scores from 0.6324 to 0.7125. It was not rerun after review-driven wording refinements because embedding credentials were unavailable locally.

GitHub issue number?

Closes #2704

Pre-merge Checklist

• Required for All PRs

  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Created a changelog entry if the change falls among the following: new feature, bug fix, UI/UX update, breaking change, or updated dependencies. Follow the changelog entry guide

• For MCP tool changes:

  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes running the script ./eng/scripts/Process-PackageReadMe.ps1. See Package README
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For renamed tools, follow the Tool Rename Checklist and tag the PR with the breaking-change label — N/A, this is a new tool rather than a rename
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description — N/A, Storage Intelligence does not have a public API documentation URL

• Extra steps for Azure MCP Server tool changes:

  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs: N/A, submitted by a Microsoft contributor
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.) — N/A
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline — pending required live-test approval below

• Required live-test pipeline run

Invoking Livetests

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